Which of the following is restricted to residential use only under the Virginia Condominium Act?

The correct choice is condominium units because, under the Virginia Condominium Act, these units are specifically designed for residential use. The Act establishes the legal framework for the creation and management of condominiums, and it typically applies to structures that are intended for residential purposes, such as individual housing units within a multi-unit building.

Condominium units often come with shared ownership of common elements, such as hallways and recreational facilities, which reinforces their classification as residential properties. This means that the Act governs aspects like maintenance, ownership rights, and the responsibilities of both the unit owners and the association.

In contrast, townhouses and single-family homes can exist as individual properties that do not necessarily fall under the condominium structure and can be used for a variety of purposes, including residential, commercial, or mixed-use. Mixed-use buildings are specifically designed to incorporate both residential and commercial spaces, which also diverges from the residential-only focus mandated by the Act for condominium units. Thus, it is clear that among the options, condominium units are fundamentally structured for residential use only according to the Virginia Condominium Act.